CN111245454B - Communication method and system for preventing same frequency interference signals - Google Patents
Communication method and system for preventing same frequency interference signals Download PDFInfo
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- CN111245454B CN111245454B CN202010336524.3A CN202010336524A CN111245454B CN 111245454 B CN111245454 B CN 111245454B CN 202010336524 A CN202010336524 A CN 202010336524A CN 111245454 B CN111245454 B CN 111245454B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B2001/1045—Adjacent-channel interference
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Abstract
The invention provides a communication method and a system for resisting co-channel interference signals, wherein a slave base station receives co-channel interference signals, a first useful signal and a first offset signal which are transmitted by a master base station, the co-channel interference signals are separated based on a second offset signal and a second useful signal in the master base station, the second useful signal is a copy of the first useful signal, a third offset signal is generated based on the co-channel interference signals, the master base station superposes and transmits the third offset signal and the second useful signal, the slave base station receives the co-channel interference signals in real time to generate the third offset signal, and the third offset signal and the second useful signal are superposed and then transmitted, so that the anti-interference signals at a transmitting end of a communication system are realized; the method not only ensures the hot standby redundancy of the communication system, but also improves the utilization rate of the slave base station, simultaneously can dynamically offset interference signals, can deal with burst co-channel interference signals, has lower cost, and does not need to add new equipment in the existing hot standby redundancy system.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to a communication method and a communication system for resisting co-channel interference signals.
Background
With the development of modern communication technology and the application of the modern communication technology in the field of railway track traffic, the role played by a railway wireless communication system is more and more important, and the railway wireless communication system is an important means for ensuring information interaction between a train and a ground system. The ground system needs to acquire various dynamic data of the train in time, and the functions of dispatching and commanding, remote fault diagnosis, remote maintenance and the like of the train are realized, so that the requirements on the reliability, the availability and the maintainability of the railway wireless communication system are higher. In the field of railway track traffic, in order to guarantee the stability and safety of long-term operation of trains, key equipment of a railway wireless communication system basically adopts a hot standby redundancy configuration mode.
In communication engineering, some key components or functions are artificially configured repeatedly for the reasons of system safety, reliability and the like, which is redundancy. When a system fails, for example, a certain device is damaged, the redundantly configured components can be used as a backup to timely intervene and undertake the work of the failed components, thereby reducing the failure time of the system. The hot standby redundancy master-slave equipment can realize quick switching, and when the master equipment fails, the redundancy configured slave equipment can timely intervene and undertake the work of the failed master equipment, so that the failure time of a communication system is greatly reduced, and the long-term reliable transmission of communication data is ensured.
The redundancy configuration of the railway communication equipment strengthens the reliability of the communication system on one hand and also increases the networking cost and the operation and maintenance cost of the communication system on the other hand. In the current railway wireless communication system, the hot standby redundancy scheme still stays at the redundancy configuration scheme in the traditional sense. When the communication system main equipment normally operates, the slave equipment is always in a monitoring or dormant state and does not undertake specific work. And only when the master equipment has a fault, the slave equipment starts to operate and formally takes over the work of the master equipment. The traditional hot standby redundancy mode causes the effective utilization rate of the slave equipment of the railway wireless communication system to be low, which is undoubtedly a waste of communication equipment resources.
In addition, the railway wireless communication system is sensitive to environmental interference, especially a railway narrowband wireless communication system. In a railway passenger station or a freight station, a railway wireless communication system is often subjected to interference of external common-frequency signals, and the communication speed and the communication quality of the railway communication system are greatly influenced. In order to solve the problem of external co-frequency interference of a site, two methods can be generally adopted to analyze, position and eliminate the external co-frequency interference source, firstly, a handheld frequency scanner is adopted to carry out frequency scanning regularly, and the method is suitable for coping with the external co-frequency interference source which is fixed for a long time and cannot cope with the sudden external co-frequency interference source; secondly, a frequency spectrum monitoring system is independently built to carry out long-term real-time monitoring, but the method increases the network building cost and the installation space of the railway station communication system, and is not beneficial to large-scale popularization and application.
Disclosure of Invention
Aiming at the problems, the invention provides a communication method for resisting co-channel interference signals, which comprises the steps of receiving the co-channel interference signals, a first useful signal and a first offset signal transmitted by a main base station from the base station;
separating out co-channel interference signals based on a second offset signal and a second useful signal in the main base station, wherein the second offset signal is a copy of the first offset signal, and the second useful signal is a copy of the first useful signal;
generating a third cancellation signal based on the co-channel interference signal;
and the main base station superposes the third cancellation signal and the second useful signal and transmits the third cancellation signal and the second useful signal.
Preferably, the co-channel interference signal is separated based on the second cancellation signal and a second useful signal in the main base station; the generation of the third cancellation signal based on the co-channel interference signal specifically includes:
the slave base station separates out co-channel interference signals based on the second offset signals and second useful signals in the master base station;
the slave base station generates a third cancellation signal based on the co-channel interference signal.
Preferably, the co-channel interference signal is separated based on the second cancellation signal and a second useful signal in the main base station; the generation of the third cancellation signal based on the co-channel interference signal specifically includes:
the slave base station separates out co-channel interference signals based on the second offset signals and second useful signals in the master base station;
the main base station generates a third cancellation signal based on the co-channel interference signal.
Preferably, the co-channel interference signal is separated based on the second cancellation signal and a second useful signal in the main base station; the generation of the third cancellation signal based on the co-channel interference signal specifically includes:
the main base station separates out co-channel interference signals based on the second offset signals and second useful signals in the main base station;
the main base station generates a third cancellation signal based on the co-channel interference signal.
Preferably, the co-channel interference signal is separated based on the second cancellation signal and a second useful signal in the main base station; the generation of the third cancellation signal based on the co-channel interference signal specifically includes:
the main base station separates out co-channel interference signals based on the second offset signals and second useful signals in the main base station;
the slave base station generates a third cancellation signal based on the co-channel interference signal.
Preferably, whether the strength of the co-channel interference signal exceeds a preset threshold value is judged, and if the strength of the co-channel interference signal exceeds the preset threshold value, the co-channel interference signal is sent to an external processing mechanism.
The invention also provides a communication system for resisting co-channel interference signals, which comprises:
the slave base station is close to the master base station, a first useful signal and a first offset signal transmitted by the master base station are received by the slave base station antenna through an air interface in real time, and meanwhile, the slave base station antenna also receives nearby co-channel interference signals;
the main base station is used for superposing the third cancellation signal and the second useful signal and transmitting the third cancellation signal and the second useful signal;
the method comprises the following steps that subtraction operation is carried out on a first useful signal, a first offset signal and a co-channel interference signal received by a slave base station, a second offset signal and a second useful signal in a master base station to obtain the co-channel interference signal; the second counteracting signal is a copy of the first counteracting signal, the first counteracting signal is generated by the previous work cycle, and the second useful signal is a copy of the first useful signal;
and any one of the master base station and the slave base station is used for generating a third cancellation signal based on the co-channel interference signal.
Preferably, either the master base station or the slave base station is further configured to transmit the co-channel interference signal to an external processing mechanism.
The communication method and the system for resisting the same frequency interference signals generate a third offset signal by receiving the same frequency interference signals from the base station in real time, and the third offset signal and a second useful signal are superposed and then emitted, so that the anti-interference signals at the transmitting end of the communication system are realized; the method not only ensures the hot standby redundancy of the communication system, but also improves the utilization rate of the slave base station, simultaneously can dynamically offset interference signals, can deal with burst co-channel interference signals, has lower cost, and does not need to add new equipment in the existing hot standby redundancy system.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a communication method for resisting co-channel interference signals according to an embodiment of the invention;
FIG. 2 is a flow chart of a first embodiment of a communication method for resisting co-channel interference signals according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a second communication method for resisting co-channel interference signals according to an embodiment of the present invention;
FIG. 4 is a flowchart of a third embodiment of a communication method for resisting co-channel interference signals according to the present invention;
FIG. 5 is a flowchart illustrating a fourth embodiment of a communication method for resisting co-channel interference signals according to the present invention;
FIG. 6 is a diagram of a first communication system structure for resisting co-channel interference signals according to an embodiment of the present invention;
FIG. 7 is a diagram showing a second communication system structure for resisting co-channel interference signals according to an embodiment of the present invention;
FIG. 8 is a diagram showing a third structure of a communication system for resisting co-channel interference signals according to an embodiment of the present invention;
fig. 9 is a schematic diagram showing a fourth structure of a communication system for resisting co-channel interference signals according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The carrier frequency of the co-channel interference signal is the same as the carrier frequency of the useful signal, and the co-channel interference signal and the useful signal are superposed to cause signal distortion, so that a receiving end cannot receive accurate data, the embodiment of the invention provides a communication method for resisting the co-channel interference signal, which is suitable for a railway communication system and can also be used in communication systems in other fields, and the co-channel interference signal near a transmitting end is counteracted by utilizing a hot standby redundant communication system of the signal transmitting end to ensure the purity of the transmitted signal, and as shown in fig. 1, the communication method comprises the following specific steps:
in a working cycle of a communication system, a main base station transmits a first useful signal and a first offset signal outwards through an antenna, wherein the first offset signal is generated by the previous working cycle, so that the first useful signal and the first offset signal transmitted by the main base station are received in real time through an air interface by a slave base station antenna in the first cycle when the communication system starts, and meanwhile, the slave base station antenna also receives nearby co-channel interference signals;
the main base station or the slave base station is also provided with a first offset signal copy generated in the previous cycle, the first offset signal copy is called a second offset signal, the second useful signal and the second offset signal are combined with the first useful signal, the first offset signal and the same-frequency interference signal received from the base station, namely the first useful signal, the first offset signal and the same-frequency interference signal are subjected to subtraction operation with the second useful signal and the second offset signal to obtain the same-frequency interference signal;
generating a third counteracting signal based on the same frequency interference signal, wherein the third counteracting signal has opposite phase with the same frequency interference signal and same frequency and amplitude;
the main base station superposes the third offset signal and the second useful signal, the superposed third offset signal and the superposed second useful signal are transmitted out through the antenna, and the transmitted third offset signal and the same-frequency interference signal are offset, so that the receiving end can receive the pure first useful signal.
The communication method in the embodiment utilizes the slave base station of the communication system to monitor the co-frequency interference signals in real time, the hot standby redundancy of the communication system is ensured, the monitoring and dynamic elimination of the external co-frequency interference signals are realized, the anti-interference capability of the transmitted signals is improved, and the quality of the signals received by the receiving end is effectively improved, so that the utilization rate of the redundant equipment of the communication system is improved, and because no additional equipment is added, the monitoring cost of the interference signals of the communication system is reduced compared with the monitoring cost of the interference signals of the communication system which is independently built in the prior art, and the real-time performance is better compared with the prior art which adopts a handheld frequency scanner to regularly scan.
In this embodiment, there are four schemes for separating the co-channel interference signal and generating the third cancellation signal, which are shown in fig. 2 to 5, and the specific schemes are as follows.
According to the first scheme, as shown in fig. 2, after a slave base station receives a first useful signal and a first cancellation signal transmitted by a master base station, a co-channel interference signal and a second useful signal received by a wired manner in the master base station, the slave base station performs subtraction operation on the first useful signal, the first cancellation signal and the co-channel interference signal with the second useful signal and the second cancellation signal to obtain a real-time co-channel interference signal, the slave base station generates a third cancellation signal with opposite phases and same frequency and amplitude based on the co-channel interference signal, the master base station superposes the third cancellation signal and the second useful signal, and the superposed third cancellation signal and the superposed second useful signal are transmitted through an antenna. In the next working cycle, the third counteracting signal becomes the first counteracting signal, in addition, the separated co-frequency interference signal is sent to the interference signal analysis system from the base station, the interference signal analysis system judges whether the strength of the co-frequency interference signal exceeds a preset threshold value, if the strength of the co-frequency interference signal exceeds the preset threshold value, the interference positioning tester is utilized to carry out frequency sweep analysis and position the position of the interference signal source, the position information of the interference signal source is reported, and the interference signal source is eliminated through manual review.
According to a second scheme, as shown in fig. 3, after receiving a first useful signal and a first canceling signal transmitted by a master base station, a co-channel interference signal and a second useful signal received in a wired manner, the slave base station performs subtraction operation on the first useful signal, the co-channel interference signal and the first canceling signal as well as the second useful signal and the second canceling signal to obtain a real-time co-channel interference signal, the slave base station transmits the co-channel interference signal to the master base station, the master base station generates a third canceling signal with opposite phases and same frequency and amplitude based on the co-channel interference signal, the master base station superimposes the third canceling signal and the second useful signal, and transmits the superimposed third canceling signal and the superimposed second useful signal through an antenna. And in addition, the separated co-frequency interference signal is sent to an interference signal analysis system from the base station, the interference signal analysis system judges whether the strength of the co-frequency interference signal exceeds a preset threshold value, if so, an interference positioning tester is utilized to carry out frequency sweep analysis and position the interference signal source, the position information of the interference signal source is reported, and the interference signal source is eliminated through manual review.
According to a third scheme, as shown in fig. 4, after receiving a first useful signal, a first canceling signal and a co-frequency interference signal transmitted by a main base station from a base station, the main base station transmits the first useful signal, the first canceling signal and the co-frequency interference signal to the main base station, and then performs subtraction operation on the first useful signal, the first canceling signal and the co-frequency interference signal, as well as a second useful signal and a second canceling signal to obtain a real-time co-frequency interference signal, the main base station generates a third canceling signal with opposite phases, same frequency and same amplitude based on the co-frequency interference signal, and then superimposes the third canceling signal and the second useful signal, and transmits the superimposed third canceling signal and the superimposed second useful signal through an antenna. In addition, the main base station sends the separated co-frequency interference signals to an interference signal analysis system, the interference signal analysis system judges whether the intensity of the co-frequency interference signals exceeds a preset threshold value, if the intensity of the co-frequency interference signals exceeds the preset threshold value, an interference positioning tester is used for carrying out frequency sweeping analysis and positioning the position of an interference signal source, the position information of the interference signal source is reported, and the interference signal source is eliminated through manual review.
According to a fourth scheme, as shown in fig. 5, after receiving a first useful signal, a first canceling signal and a co-frequency interference signal transmitted by a master base station, a slave base station transmits the first useful signal, the first canceling signal and the co-frequency interference signal to the master base station, the master base station performs subtraction operation on the first useful signal, the first canceling signal and the co-frequency interference signal as well as a second useful signal and a second canceling signal to obtain a real-time co-frequency interference signal, and transmits the co-frequency interference signal to a slave base station, the slave base station generates a third canceling signal with opposite phases and same frequency and amplitude based on the co-frequency interference signal, the slave base station transmits the third canceling signal to the master base station, the master base station superimposes the third canceling signal and the second useful signal, and transmits the superimposed third canceling signal and the second useful signal through an antenna. In addition, the main base station sends the separated co-frequency interference signals to an interference signal analysis system, the interference signal analysis system judges whether the intensity of the co-frequency interference signals exceeds a preset threshold value, if the intensity of the co-frequency interference signals exceeds the preset threshold value, an interference positioning tester is used for carrying out frequency sweeping analysis and positioning the position of an interference signal source, the position information of the interference signal source is reported, and the interference signal source is eliminated through manual review.
Illustratively, the preset threshold may be-50 dBm, and the specific threshold may be adjusted according to the field situation.
If the same frequency interference signal is strong and the signal strength is greater than-50 dBm, the interference positioning tester is required to perform frequency sweep analysis and position the interference signal source, and the position information of the interference signal source is reported and the interference signal source is eliminated through manual review.
If the co-channel interference signal is weaker and the signal strength is less than-50 dBm, the interference signal does not need to be further processed and does not need to be manually intervened.
Compared with the prior art, the communication method for resisting the co-channel interference signals fully plays the role of the slave base station, greatly improves the utilization rate of the slave base station, firstly proposes to eliminate and inhibit the co-channel interference signals at the signal transmitting end, greatly improves the anti-interference capability of the signals transmitted by the master base station, and also greatly simplifies the complexity of train receiving equipment because the complex received signal interference elimination processing is carried out on the ground side, and firstly proposes to utilize the linkage mode of the master base station and the slave base station to inhibit and eliminate the co-channel interference signals.
In addition, the external same-frequency interference signal can be generated by external equipment, or can be generated by a main base station or a slave base station; the communication method can be applied to railway wireless communication systems of different train speed grades and can also be applied to railway wireless communication systems under mixed running scenes of different train speed grades; the communication method can be applied to a narrow-band communication system and is also suitable for a broadband communication system.
The embodiment of the invention also provides a communication system for resisting co-channel interference signals, which comprises:
the slave base station is used for receiving the co-channel interference signal and a first useful signal and a first offset signal transmitted by the master base station;
the main base station is used for superposing the third cancellation signal and the second useful signal and transmitting the third cancellation signal and the second useful signal;
if the adopted communication method is scheme one, the slave base station is also used for separating out co-channel interference signals based on a second useful signal in the master base station and a second offset signal in the slave base station, and generating a third offset signal based on the co-channel interference signals;
if the adopted communication method is scheme two, the slave base station is also used for separating out co-channel interference signals based on a second useful signal and a second counteracting signal in the master base station, and the master base station is also used for generating a third counteracting signal based on the co-channel interference signals;
if the adopted communication method is scheme three, the main base station is also used for separating out co-channel interference signals based on a second useful signal and a second offset signal in the main base station and generating a third offset signal based on the co-channel interference signals;
if the adopted communication method is scheme four, the master base station is further used for separating co-channel interference signals based on the second useful signals in the master base station and the second offset signals in the slave base station, and the slave base station is further used for generating third offset signals based on the co-channel interference signals.
The structure of the base station mainly comprises an antenna unit, a radio frequency processing unit (RRU) and a baseband processing unit (BBU); the antenna unit is used for mainly completing the receiving and sending of signals and is an information energy converter between the base station equipment and a terminal user; the radio frequency processing unit is an intermediate bridge communicated with the antenna unit and the baseband processing unit, when receiving signals, the radio frequency processing unit converts radio frequency signals transmitted by the antenna into optical signals through filtering, low-noise amplification and transmission, and transmits the optical signals to the baseband processing unit; the baseband processing unit mainly completes channel coding and decoding, modulation and demodulation of baseband signals, protocol processing and other functions, and simultaneously needs to provide an interface function with an upper network element.
The main base station and the slave base station in this embodiment have the following four design structures, as shown in fig. 6 to 9, and the following four structures are described in detail.
Configuration one as shown in fig. 6, the master base station includes a master antenna unit, a master rf processing unit and a master baseband processing unit, and the slave base station includes a slave antenna unit, a slave rf processing unit and a slave baseband processing unit; if the applied method is the first scheme, in a working cycle of the anti-co-channel interference signal, the main antenna unit transmits a first useful signal and a first counteracting signal, the slave antenna unit receives the co-channel interference signal and the first useful signal and the first counteracting signal transmitted by the main antenna unit, the slave antenna unit transmits the signals to the slave radio frequency processing unit, the slave radio frequency processing unit processes the signals and transmits the signals to the slave baseband processing unit, the slave baseband processing unit also receives a second useful signal in the main baseband processing unit through a core network, the slave baseband processing unit separates the co-channel interference signal based on the second useful signal and the second counteracting signal, generates a third counteracting signal based on the co-channel interference signal, and transmits the third counteracting signal to the main baseband processing unit through the core network, and the main baseband processing unit superposes the third counteracting signal and the second useful signal, then processed by the main RF processing unit and transmitted by the main antenna unit.
If the applied method is scheme two, the main antenna unit transmits the first useful signal and the first cancellation signal, the slave antenna unit receives the co-channel interference signal and the first useful signal and the first cancellation signal transmitted by the main antenna unit, the main baseband processing unit generates a third offset signal based on the co-frequency interference signal, and transmits the third offset signal to the slave baseband processing unit through the core network, and the third offset signal and the second useful signal are superposed, processed by the main radio frequency processing unit and transmitted by the main antenna unit.
If the applied method is scheme three, the main antenna unit transmits a first useful signal and a first offset signal, the slave antenna unit receives a same frequency interference signal and the first useful signal and the first offset signal transmitted by the main antenna unit, the first useful signal and the first offset signal are transmitted to the main radio frequency processing unit through the core network, the main radio frequency processing unit processes the signals and transmits the signals to the main baseband processing unit, the main baseband processing unit separates the same frequency interference signal based on the second useful signal and the second offset signal, generates a third offset signal based on the same frequency interference signal, superposes the third offset signal and the second useful signal, processes the signals by the main radio frequency processing unit, and transmits the signals by the main antenna unit.
If the applied method is scheme four, the main antenna unit transmits a first useful signal and a first cancellation signal, the slave antenna unit receives the co-channel interference signal and the first useful signal and the first cancellation signal transmitted by the main antenna unit, the main baseband processing unit separates out co-frequency interference signals based on second useful signals and second offset signals, the main baseband processing unit sends the co-frequency interference signals to the slave baseband processing unit through the core network, the slave baseband processing unit generates third offset signals based on the co-frequency interference signals and sends the third offset signals to the main baseband processing unit, and the main baseband processing unit superposes the third offset signals and the second useful signals, processes the third offset signals and the second useful signals through the radio frequency processing unit and sends the third offset signals to the main antenna unit.
Structure two is as shown in fig. 7, the master base station includes a master antenna unit and a master rf processing unit, the slave base station includes a slave antenna unit and a slave rf processing unit, and the master base station and the slave base station share a baseband processing unit.
The third structure is as shown in fig. 8, the master base station includes a master radio frequency unit and a master baseband processing unit, the slave base station includes a slave radio frequency unit and a slave baseband processing unit, the master base station and the slave base station share one antenna unit, a duplexer is arranged in the antenna unit, and can simultaneously receive and transmit signals, in any of the four schemes, the superimposed first useful signal and third canceling signal are transmitted through the antenna unit, and the slave base station also receives the first useful signal, the first canceling signal and the same-frequency interference signal through the antenna unit, and other processes of the four schemes are the same as the first structure and are not described again.
The structure four is as shown in fig. 9, the master base station includes a master radio frequency unit, the slave base station includes a slave radio frequency unit, the master base station and the slave base station share one antenna unit and one baseband processing unit, a duplexer is arranged in the antenna unit, and can simultaneously receive and transmit signals, in any of the four schemes, the superimposed first useful signal and third canceling signal are transmitted through the antenna unit, the slave base station also receives the first useful signal, the first canceling signal and the same-frequency interference signal through the antenna unit, the separation of the same-frequency interference signal and the generation of the third canceling signal are only completed in the one baseband processing unit, and the rest processes of the four schemes are not described again.
Any one of the master base station and the slave base station is also used for sending the co-channel interference signal to an external processing mechanism; specifically, the baseband processing unit sends the co-frequency interference signal to an external processing mechanism, namely, an interference signal analysis system, which is used for analyzing whether the co-frequency interference signal strength exceeds a preset threshold value, and then determining whether the positioning and elimination of the interference source are needed.
In an embodiment of the invention, the master and slave antenna elements are put together by default if they are provided separately. If the main antenna element and the slave antenna element are too far apart, the interference signal suppression effect will be reduced.
The "master base station" and the "slave base station" mentioned in the embodiments of the present invention are not limited to the base station, and may be replaced by "master device" and "slave device", and other communication transceiving systems, modules, and the like having similar functions.
In the embodiment of the invention, the communication base station adopts a separate hot standby redundancy mode, and actually, components of the hot standby redundancy can also be packaged together, such as communication chip redundancy and communication module redundancy. The appearance of hot standby redundant components is many, such as: discrete, integral, etc. Hot standby redundant communication component content is also numerous, such as: chip redundancy, module redundancy, board redundancy, complete machine redundancy and the like can be realized.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A communication method for resisting co-channel interference signals is characterized in that:
the master base station and the slave base station are in a hot standby redundancy relationship with each other, the slave base station is close to the master base station, a first useful signal and a first offset signal transmitted by the master base station are received by the slave base station antenna through an air interface in real time, and meanwhile, the slave base station antenna also receives nearby co-channel interference signals;
carrying out subtraction operation on a first useful signal, a first offset signal and a co-channel interference signal received from a base station, a second offset signal and a second useful signal in a main base station to obtain the co-channel interference signal, wherein the second offset signal is a copy of the first offset signal, the first offset signal is generated by a previous work cycle, and the second useful signal is a copy of the first useful signal;
generating a third cancellation signal based on the co-channel interference signal;
and the main base station superposes the third cancellation signal and the second useful signal and transmits the third cancellation signal and the second useful signal.
2. The communication method according to claim 1, wherein the first useful signal, the first cancellation signal and the co-channel interference signal received from the base station are subtracted from the second cancellation signal and the second useful signal in the main base station to obtain the co-channel interference signal; the generation of the third cancellation signal based on the co-channel interference signal specifically includes:
the slave base station separates out co-channel interference signals based on the second offset signals and second useful signals in the master base station;
the slave base station generates a third cancellation signal based on the co-channel interference signal.
3. The communication method according to claim 1, wherein the first useful signal, the first cancellation signal and the co-channel interference signal received from the base station are subtracted from the second cancellation signal and the second useful signal in the main base station to obtain the co-channel interference signal; the generation of the third cancellation signal based on the co-channel interference signal specifically includes:
the slave base station separates out co-channel interference signals based on the second offset signals and second useful signals in the master base station;
the main base station generates a third cancellation signal based on the co-channel interference signal.
4. The communication method according to claim 1, wherein the first useful signal, the first cancellation signal and the co-channel interference signal received from the base station are subtracted from the second cancellation signal and the second useful signal in the main base station to obtain the co-channel interference signal; the generation of the third cancellation signal based on the co-channel interference signal specifically includes:
the main base station separates out co-channel interference signals based on the second offset signals and second useful signals in the main base station;
the main base station generates a third cancellation signal based on the co-channel interference signal.
5. The communication method according to claim 1, wherein the first useful signal, the first cancellation signal and the co-channel interference signal received from the base station are subtracted from the second cancellation signal and the second useful signal in the main base station to obtain the co-channel interference signal; the generation of the third cancellation signal based on the co-channel interference signal specifically includes:
the main base station separates out co-channel interference signals based on the second offset signals and second useful signals in the main base station;
the slave base station generates a third cancellation signal based on the co-channel interference signal.
6. The method according to any one of claims 1 to 5, wherein it is determined whether the strength of the co-channel interference signal exceeds a preset threshold, and if the strength of the co-channel interference signal exceeds the preset threshold, the co-channel interference signal is sent to an external processing mechanism.
7. A communication system resistant to co-channel interference signals, comprising:
the slave base station is close to the master base station, a first useful signal and a first offset signal transmitted by the master base station are received by the slave base station antenna through an air interface in real time, and meanwhile, the slave base station antenna also receives nearby co-channel interference signals;
the main base station is used for superposing the third cancellation signal and the second useful signal and transmitting the third cancellation signal and the second useful signal;
any one of the master base station and the slave base station is used for carrying out subtraction operation on the first useful signal, the first offset signal and the co-channel interference signal received from the slave base station, the second offset signal and the second useful signal in the master base station to obtain the co-channel interference signal; the second counteracting signal is a copy of the first counteracting signal, the first counteracting signal is generated by the previous work cycle, and the second useful signal is a copy of the first useful signal;
any one of the master base station and the slave base station is used for generating a third cancellation signal based on the co-channel interference signal;
the master base station and the slave base station are in hot standby redundancy relationship with each other.
8. The co-channel interference signal resistant communication system according to claim 7, wherein any one of the master base station and the slave base station is further configured to transmit the co-channel interference signal to an external processing mechanism.
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